# How many strings make up protons, neutrons, and electrons?

So I understand that:

Protons= 2 up quarks and a down quark... and
Neutrons= an up quark and 2 down quarks... and
Electrons are not made of quarks (so small!)

So my questions are:

1.) According the Heisenberg Uncertainty Principle, we don't know how many strings (according to string theory) make up electrons, correct? Please, someone, candor is appreciated if I'm wrong.

2.) And how many strings make up a proton, a neutron, an up quark, and a down quark?

I would imagine that if the number of strings making a an up quark were represented by U and the number of strings making up a down quark were represented by D then the formulas for strings in protons and neutrons would look like...

P=2U+D
N=2D+U

Sorry; these questions are rudimentary, and if the amount of quarks making up neutrons and protons are unknown, then I'll feel like quite a fool for asking this.

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Welcome to the forum!
1.) The HUP doesn't have anything to do with strings. It has to do with the uncertainty in measuring the position and momentum of a particle.
2.) In string theory, particles are not points but strings. So each quark would be composed of 1 string.
Hope this helps.

Each elementary particle is a single string.

The HUP has to do with repeated measurements of some particle [wave] characteristics, say position and momentum. If you repeat the same sequence of arbitrarily precise measurements on a large numbers of identically prepared particles the measurements are not all identical as would be expected classically; instead the measurements form a probability distribution of different values.

Just to be a little more specific, you can measure the position very precisely but the momentum will be uncertain, or you can measure the momentum very precisely but the position will be uncertain. You just cannot measure both precisely, simultaneously. http://en.wikipedia.org/wiki/Uncertainty_principle

Isaac0427
Gold Member
2.) In string theory, particles are not points but strings. So each quark would be composed of 1 string.
Hope this helps.
How does a string turning into a particle work?

Drakkith
Staff Emeritus